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(No Model.)

'ntsysoYNToN. VALVE FOR PNEUMATIC PIPES 0R TUBES. No. 491,680. Patented Apr. 16. 1889..

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EDWARD S. BOYNTON, OF NEW YORK, N. Y., ASSIGNOR TO THE CAMPBELL PRINTING PRESS AND MANUFACTURING COMPANY, OF SAME PLACE.

VALVE FOR PNEUMATIC PIPES OR TUBES.

SPECIFICATION forming part of Letters Patent No. 401,680, dated April 16, 1889. Application filed December 1, 1887. gerial No. 256,610 (No model.)

To all whom it may concern:

Be it known that I, EDWARD S. BOYNTON, of the city of New York, in the county and State of New York, have invented a new and useful Improvement in Valves for Pneumatic Pipes or Tubes, which invention is fully set forth and illustrated in the following specification and accompanying drawings.

The object of this invention is to render external valves for pneumatic pipes more cer- I tain and durable in their operation as selfclosing valves.

The invention will first be described in detail, and then particularly set forth in the T 5 claims.

In the accompanying drawings, Figure 1 illustrates in exterior side elevation a valve as attached to the pipe of a vacuum-brake for railroad-cars. Fig. 2 shows a longitudizo nal vertical section through Fig. 1.

Said figures illustrate the well known Eames vacuum-brake valves with my improvement applied thereto.

In said figures the several parts are indi- 2 5 cated by letters as follows: To the pipe proper or coupling, A, adapted to be secured to a rubber hose at one end, is fitted at the other end a rubber or other valve-seat, a, and faced to fit said seat is the valve (9, pivoted at c between two similar lugs, cl. Said valve is connected by a web, 6, to a boss, f, through the eye of which the valve is pivoted at c, as before said. Said boss is cored out, as shown in Fig. 2, and extended above into a handle or 3 5 lever, B, and in an opposite direction over the web 6 into a hollow tube, C. The open end of said tube is closed with a screw-plug, p, and the bore of the tube is filled with acoiled spring, s, one of whose ends bears upon said plug and the other against a stop, g, formed 011 the boss h of an arm, 70. An eye in the boss 7t coincides with the eyes in the lugs cl and boss f, and a single pin, 0, is passed through all of said eyes, forming a pivot for the valve l), as shown. The catch or clip Zon the end of the pipeAshows apart of the wellknown coupling-clutch for vacuum -brake pipes, which mates with a counterpart when the two pipes are coupled. It is obvious, now, that when thehandlesB of the opposite valves are depressed the valves 19 will rise from their seats, turning upon centers at 0. Thus angular motion of each valve will compress its inclosed spring 5 against the stop g, said spring thus always opposing the opening of the valve. 5 5 As soon as the handles B are released, each valve will fly closed upon its seat by the re action of its spring .9. This the valve shown in the drawings, however, cannot do as long asits pipe is coupled to an other pipe; but immediately upon the uncoupling the valve will fly shut. In order to couple, each handle B must first be depressed. It is also quite obvious now that if a valve similar to Z), with a spring attachment such as shown, were attached to a wind-instrument as akey, for i11- stance, to some musical wind-instru1nentthe depression of the handle B would open the key, and upon release of the handle 13 the key would automatically close. Not only can this valve and its mechanism be made very neat and small where required, but its spring is unseen, is protected from dirt within its case, and equally protected from the weather.

Valves of this character are necessarily 5 closed through the action of a spring. In the well-known vacuum-brake valves above referred to the spring enwraps the pivot upon which thevalve oscillates, one end of the spring actingupon the valve and the other reacting upon the case, the operc tion being to effect torsional action in the spring. It is well known in employing springs of this variety that they are very perishable, because of, first, the liability of the bent ends to break off through the trans- 8 5 verse strain brought upon the metal, and, second, because of the necessarily small limit given to the length of wire in the spring and consequent short life of such spring through great fleXure or twisting in operation at any 0 given point in the wire. WVith valves of this description it would be particularlyfatal to have them closed by a perishable spring or one liable to rapid deterioration. It is therefore very desirable to insure permanency or 5 long life to the springs for said valves. The

spring used in the brake valves above mentioned, aside from its liability to fracture at its reacting ends or through excessive torsion for the length of wire employed, is subject to the deteriorating influences of grit, dirt, moisture, snow, and ice, some of which are always road-car.

length of wire admissible.

more or less present under and about a rail- It is the object, then, of this invention to replace said perishable formof spring by a compressive helical spring confined within a tube or tubular guide, effecting thereby at one and the same time the use of a spring whose material is deflected or twisted under action very much less because of the greater This construction, therefore, gives a spring much more durable or longer lived, and which will entirely avoid the contingency of the breaking oif of reacting ends, and at the same time be inclosed and protected from the deteriorating influence of grit, dirt, moisture, snow, and ice.

I am aware that helical compressive springs have been used for the automatic closing of valves, and that such a combination is not broadly new; but in such cases both the springs and valves are not external to but one or both within a valve-casing, so that, unlike in my invention, the spring is exposed to the action of either the fluids which may pass through the pipes to which the valves are attached or to external deteriorating influences, as before described.

I do not claim the coupling-pipe nor the valve proper; but,

Having thus fully described my improvement, as of my invention I claim 1. In combination with an external pivoted valve, a compressive helical spring inclosed within a tubular guide formed upon or attached to the valve, substantially as and for the purposes set forth.

2. In combination with an external pivoted valve, a self-closing device consisting of a compressive helical spring held within a tubular guide formed upon or attached to said valve between one end of said guide and a stop at the pivotal point of the valve,-substantially as and for the purposes set forth.

ED'VVARD S. BOYNTON.

Witnesses:

JOHN T. MURPHY, WM. T. VAN ALEN. 

